1. Old miners tend to be more reliable and usb miners which are made from old and new miners(makes sense)

Nothing made new is made for the normal person to make any kind of return or profit. They will either software cripple your miner or bring out a miner 5x as fast as the one you are using. Whoever decided to put few companies in charge of all electronics made a giant mistake and its pretty obvious in mining.

I know you are more knowledgable about all this than you bring on i just wanted to get my two cents in before shillbots start saying certain series of antminers, canaan and whatsminers.

btw canaan will break, antminer will break, whatsminer will overheat. they are making disposable trash and shipping it to every country but their own.

People are better off just cpu mining or gpu mining hardware for bitcoin is a waste of time most end up just giving up anyways and losing a lot of money in the process. Sometimes the truth is better than a sugar coated money grab.